Slitting device



Jan. 31, 1933. McC. JOHNSTONE 1,895,852

SLITTING DEVICE Filed May 6, 1930 3 Sheets-Sheet 1 gwvvewiioz W/i/M Jan. 31, 1933. R. M C. JOHNSTONE 1,895,352

SLITTING DEVICE Filed May 6, 1950 3 Sheets-Sheet 2 Jan. 31, 1933. R. McC. JOHNSTONE 1,895,852

SLITTING DEVICE Filed May 6, 1930 3 Sheets-Sheet 3 VENT 0R M )/C W A TTORNE Y Patented Jan. 31, 193$ UNITED STATES ROBERT H0O. JOHNSTONE, OF SHORT HILL PATENT OFFIC S, NEW JERSEY, ASSIGNOR 'IO CAMERON MACHINE COMPANY, OF BROOKLYN, NEW YORK, A. CORPORATION OE NEW YORK SLITTIN G DEVICE Application filed May 6, 1930. Serial No. 450,080..

This invention relates generally to slitting devices, and has more particularly reference to slitting devices of the type designated score-cut, in which a relatively blunt cutting wheel engages a smooth-surface backingroll or member.

The main object and feature of the inventi on is to render devices of this character more simple in construction and more reliable in operation than the slitting devices now 1n use, and particularly to minimize vibration and chattering of the score-cut wheels.

In the accompanying drawings, the invention is disclosed in several concrete and preferred forms in which:

Fig. 1 is a view in front elevation of a device embodying the invention looking in the direction of arrow 1 of Fig. 2, showing three score-cut wheels, one in elevation, another in section substantially on the plane of line 11 of Fig. 2, and a third in section subitantially on the plane of line 1 1 of Fig. '2'is a vertical sectional view substanti ally on the plane of line 2-2 of Fig. 1;

Fig. 3 is a perspective detail view of a slidable yoke;

Fig. 4 is a view similar to Fig. 2 but showing a modification;

Fig. 5 is a view somewhat similar to Fig. 2 but showing a second modification;

Fig. 6 is a vertical sectional view substantially on the plane of line 66 of Fig. 5; and

Fig. 7 is a detail view of the yoke used in the construction of Figs. 5 and 6.

The construction of slitting device heretofore generally used in the art is well exemplik fied by the disclosure of Patent No. 1,076,189 where it will be seen that the score-cut slitter is mounted in aslitter lever which rocks on a crown-bar that is provided with spacer cheeks adjustable on the crownbar in a wellunderstood manner. The crown-bar is moved up or down by means of an eccentric, or otherwise, and a spring extends from the tail end of the slitting lever to a fixed point on the framework. From this it will be understood that, if there is any tendency on the part of the score-cut wheel to vibrate and to leave the backing member or roll, such tendency will be transmitted to the slitter lever and the inertia of the latter will produce a lag in the vibrating-motion. To overcome this, excessive spring pressure has to be em ployed in an effort to minimize vibration, but such excessive spring pressure tends to abnormally increase the friction at the slitting point and is therefore undesirable. Furthermore, not only is there a tendency on the part of the score-cut slitter to wobble be tween the side cheeks of the slitter lever but there is a similar tendency for the slitter lever to wobble between the side checks of the spacer member. Both of these conditions are undesirable.

In the construction shown in the instant case these objectionable features are done away with or, at least, greatly minimized. As here shown, 10 indicates a backing member or roll which, in this case, happens to be one of the winding drums that acts to Wind flexible material 11. 12 indicates a scorecut slitter wheel to her and to slit flexible material 13. that passes between the slitter wheel and the backing member. The slitter wheel is rotatably mounted on ball bearings 14 associated with pintle 15 and the latter is carried by a yoke 16 which is slidably mounted in rectilinear guides 17 in spacer member 18. 19 indicates a spring supported at one end 20 of the spacer member and at its other end by adjustable screw 21. This spring bears against lower bifurcated end 22 of the yoke and tends to urge the yoke and slitting wheel toward the backing member. Spacer member 18 is provided with stationary side cheeks 23 closely adjacent the slitter wheel between which side cheeks said slitter wheel rotates. Member 18 is adjustably but rigidly mounted on bar 24 or beam 25. Yoke 16 is likewise provided with side cheeks 26 between which the slitter wheel rotates but these checks are in spaced relation to the slitter wheel. In the construction shown in Figs. 1 and 2, beam 25 is rotatably mounted in the framework and carries a gear 27 with which engages an;- other gear 28 provided with a. handle 29 and associated with which is a latch 30. In the construction shown in Fig. 4.- bar 24 is engage the backing memeliminated and the yoke can be made so small that its weight is about one per-cent of that of'the slitting lever. Hence there is much less vibration. Likewise there is much less tendency to wobble because not only has the slitting lever been eliminated but the slitter wheel rotates between stationary side checks in the spacer member.

The modification shown in Figs. 5, 6 and 7 difi'ers but slightly from the forms previously described. provided with side cheeks 33, closely adjacent slitter wheel 34, and with rectilinear guides 35. It will be noted, however, that said guides are not radial with respect to the center of backing member 36. It will further be observed that spring 37 engages yoke 38 with its free end 39 and is anchored at 40 on an extension 41 of the spacer member. The means for adjusting the pressure of spring 37 consists of threaded member 42 that acts against the middle portion of the spring. It will also be seen that side cheeks 33 of the spacer member closely confine slitter wheel 34, but that yoke 35 is so shaped that there is clearance between its side cheeks 43 and the slitter wheel.

I claim:

1. The combination with a backing member; of a score-cut slitting unit, associated therewith, including: a rotatable score-cut wheel to engage the backing member; a spring-pressed yoke carrying the rotatable score-cut wheel and urging it toward the backing member under yielding pressure; a spacer member to yieldably support the yoke and to guideopposite faces of the score-cut wheel; and a support, movable toward and away from the backing member, on which the spacer member is carried.

2. The combination with a backing member; of a score-cut slitting unit, associated therewith, including: a rotatable score-cut wheel to engage the backing member; a spacer member movable toward and away from the backing member and acting to guide opposite faces of the score-cut wheel; and a spring-pressed and slidable element, carried by the spacer member, acting to urge the score-cut wheel toward the backing member under yielding pressure,

3. The combination with a backing member; of a score-cut slitting unit, associated therewith, including: a rotatable score-cut Wheel to engage the backing member; a pin- Here, spacer member 32 is tle on which the score-cut wheel rotates; a spring-pressed yoke carrying the pintle and urging it and the score-cut wheel toward the backing member under yielding pressure; a spacer member to yieldably support the yoke and to guide opposite faces of the score-cut wheel; and a support, movable toward and away from the backing member, on which the spacer member is carried.

4. The combination with a backing member; of a score-cut slitting unit, associated therewith, including: a rotatable score-cut wheel to engage the backing member; a pintle on which the score-cut wheel rotates; a spacer member movable toward and away from the backing member and acting to guide opposite faces of the score-cut wheel; and a spring-pressed and slidable element, carried by the spacer member and supporting the pintle, acting to urge said pintle and thereby said wheel toward the backing member under yielding pressure.

Signed at the city of New York, in the borough of Brooklyn, county of Kings, and State of New York, this 30 day of April,

ROBERT MoC. JOHNSTONE. 

